Safety-latch for machine-controlling devices.



0. L.- SCALBOMF'.

SAFETY LATCH FOR MACHINE CONTROLLING DEVICES. APPLICATION FILED NOV. 13. 1913.

Patented Oct; 17,1916,

4 SHEET$SHEET l.

l h "lu 10.1. SCAjLBOM. SAFETY LATCH ron momma-commonwe-navlcss.

1 APPLICATJON nuso NOV. 13, 1913. 1,201,355, v Patented Oct. 17,1916.

4 sHEETs-gHEEM.

' 0. L. S CALBOM.

SAFETY LAT CH FOR MACHINE CONTROLLING DEVICES.

APPL ICATION FILED NOV. 13. 1913.

1 ,201 ,355 Patented Oct. 17, 1916.

4 SHEETS-SHEET 3- I .4044 a f f 0. L. SCALBOM. SAFETY LATCH FOR MACHINE CONTROLLING DEVICES.

APPLICATION FILED NOV. 13, I913- Patented Oct. 17,1916.

4 SHEETSSHEET 4.

To all whom it may concern:

' oscn'n. L. scAL oM, or "GLENVIEW, ILLINOIS.

. 'sAFErY-LA'rcnron mncnmn-cou'monmne DEVICES.

Be it known that I OSCAR L. SGALBOM, a citizen of the United States, and a resident of Glenview, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Safety-Latches for Machine-Controlling Devices, of which the following is a specification.

My present lnvention relates in general t safety latches and-more particularly to automatically acting latches for controlling the operating of machines, and has'special' reference to the provision of a device of the character referred to adapted for use on power driven machines repeatedly performing the same operation. v

The-principal objects of'-my present invention are, broadly stated, first: the provision of a device of the character referred.

to in the operation of machines in which the same is embodied the simultaneous use of both. of the hands of theoperator of the ma chine is required; and, second: the 'p rovi-* 5 1011 of improved means whereby but a single cycle of operation of the machine is possible until such time as the parts are re: stored to their original position bythe operator; the provisionof manually operated latc'h mechanisms for machines characterized by the requirement that one hand of the operator must be continuously employed in holding the latch mechanism out of engagement, and the other hand thereof con,-

tinuously employed, first, in throwing and 3'5 then in holding the operating mechanism into engagement for and during the period oflti me a cycle of operationof the machine g I Specification of Letters Patent. Patented ()Ct. 17 1916.- App ication fil ed November 13, 1913. Serial No; 800,891.

my present improvements as arranged for use n connectlon with a, punchpress of a type well known in the art.

. As iswell known to those who are skilled 1n the art to which my invention pertains, a

ated to the use of the machines that they be-' come careless and fail to take. proper 'precautions, not only in properly placing the material to be operated upon, but especially in keeping their hands and more particularly their fingers out of the line .of movement of the punch.

My present invention has, therefore, -a two-fold aspect, first: to require the use of both'of the hands of the operative in securingthe operation of the machine in order to keep them clear of the moving parts of the machine, and, second! in the present case, to permit but a single stroke of the ram carrying the punch, prior to such time as both hands of the operative are moved from the machine after the completion of the operation thereof and the machine restored intentionally to its original position and ready for another manually actuated operation, thus securing .not only safety to is begun and carried on and either concurrently therewith or independently thereof, automatically actuated mechanism permitting but a single complete operation of. the

machine until such mechanism is intention-' the operator but also a saving from loss or damage of the material operated upbn.

other objects as will hereinafter be disclosed provided the construction illustrated in the accompanying drawings, wherein- Flgurel 1s a slde elevatlonalvlew of a I reciprocating punch press having a safety ally reset; together with such further and additional objects as may hereinafter, appear.

While devices embodying my present improvements have a large field ofziitilityand by extension and slight modification to suit thecharacter of I machines ,wherewith they are-used, are applicable to a wide range of semi-automatic and other machine tools and qn'achines, I have found them particillarly useful in connection with reciprocating punch presses, and therefore for purposes of illustration proceed to show-and describe device for the clutch operating rod thereof,

- In accomplishing the foregoing and such- 7 v embodying my present improvements, in a preferred form, applied thereto, the parts being shown in'position ready for, the beginning of a forming operation; Figs. 2 and 3' are respectively a side elevational view anda plan view of the lever device employed'b'y me for actuating the clutch operating rod; Fig. 4 is a fragmentary view of a detailof construction of the front of the machine; Fig. 5 is a fragmentary plan view of the machine of Fig. 1; Fig. 6 is an sition,

from that there shown, for the further'op-' 'eration of the machine; Fig.9 is a view enlarged elevational view similar to Fig. 1,

showing. the parts in their extreme movement from the position .shown in said Fig. 1; Fig. 7 is a fragmentary detailed view showing the mounting of certain of the parts appearing in Fig. 6; .Fig. 8 is a still I further enlarged view of. certain of the parts shown in Fig.6 illustrating them' in the pohowever; to which they are restored taken from the rear of the machine of certain parts shownin side elevation in Fig 8;

and Fig. 10 is a fragmentary sectional-view of certain details of construction, taken centrally andlongitudinally of Fig. 8.

"Referring first to Fig.1 of the drawings,-

it will be noted that for purposes of convenience in illustration as above'suggested I have shown. a well known type of power punch presswherein amain frame having ody portions 11-11,.legs 12-12 supports a gu1de 13 in which is mounted a ram 14 carrying a punch (not shown) for forming 25 material resting in a die (not shown) carried ina base 15, the ram 14 being actuated v the .treadle rod 22. I In machines embodying my present improvements, however, the treadle is ordinarily disconnected from the rod 22 or such rod 22 disconnected from the rod 18, and the primary operating lever 23 is applied in lieu thereof. f

The lever 23 as will appear on examination of Figs. 2 and 3 is operable by the right hand of the machine operator and preferably includes a body portion 24 provided with a hook 25 adapted for engagement with the pivot pin 19 or an extensionthereof, and an oppositely disposed hook 26 adapted for engagement with the main pivot stud 21, the opposite end of the lever 23 beingprovided with a push rod 27. The hook 25 is preferably fixed in position on the part 24 in such a manner as to be easily removable therefrom, and the hook 26 is preferably pivotally mounted thereon as indicated at 28 and" adapted to be secured in position by means of a screw 29 which may be removed to the end that the hook 26 may be moved to the position indicatedin. dotted lines' in Fig. 2 for the purpose of're'moval of the lever 23 from the machine. 1

For the purpose of restraining eitheraccidental or intentional'movement of the prithe catch ageless mary lever ram 14, at all times save when the left hand of the operator is removed from the die and actively engaged in depressing of the push rod 30 of the secondary lever .31, I'h'ave pro- -"vided the safety latch mechanism which I will now proceed to describe in connection with Figs-1, 5 and 6.' r

On inspection of Fig. 5 it will be noted that the frame members 11, 11, are provided 'with rearwardly extending ears 32,32, in which is mounted a rocking counter shaft '33. At one end of the counter shaft 33 is disposed a thimble 34 fixed against rotation thereon, which thimble carries at right Iangles thereto a sleeve 35 in which the outer end 36 of the lever 31 is disposed and held in position by means of a pin 37. The lever 31 is normally .supported in the position shown in Fig. 1 by means of a tension spring 38 engaging a sliding block 39 which may be fixed in position on said lever 31 by means of a set screw 40, the.oppo site end of such 23 and hence reciprocation of the spring 38 being supported at some convenient point on one of the frame members 11 as indicated at 41. The end of the shaft 33 opposite to the thimble 34 carries fast against rotation thereon a depending lock arm 42 having a laterally extending catch pin 43 provided with. a roller 43* adapted to engage a hook 44 on a bell crank lever 45 which is pivoted at 46 to a substantially upright lock arm 47 which in turn is pivoted about said main pivot point 21 hereinabove referred to, the said lock arm 47 being provided with a removable bifurcated catch 48 held in position by a screw'49 (see Fig. 6) which normally engages (as shown in Fig. 1) the un-.

der side of a cone 50 formed at the upper extremity of a vertically movable rod 51. The rod 51 is pivotally connected to the clutch operating rod 18 at the point 19 above referred to, and is carried in an aperture in a boss 52 formed in the frame 11, a helically coiled spring 53 encircling said rod 51- and normally restrained between said boss 52 'and a pair of lock nuts 54 being supplied for the purpose of normally maintaining the rod 51 in the position indicated in Fig. 11 A spring 55 engages the lock arm 47 and said spring 551s employed for normally holding 48 in contact with the under side of the cone 50 as shown in Fig. 1. 7

Referring now more particularly to Figs. 6 and 7 it will be observed that for the purpose of lifting the lever 45 to the position shown in Fig. '1, when it is removed therefrom, I employ a coiled compression spring 56 mounted in an extension 56 of the catch rod 47. To move the arm 45 downwardly.

so as to bring about the disengagement of the hook 44 and "roller 43 the pin 57 a is provided which engages the downwardly pro- 6 to 10 ofthe drawings, it-will be'observed that for the purpose" of permitting but a single actuation of the machine, that is, in the present case, but a single revolution of-the crank shaft 16, I divide the clutch operating rod 18 into upper and lowerportions, 18

and 18 respectively, mounting them in apertures bosses 58 and 59 respectively formed on a plate 50 which may be attached to the frame member '11 by screws 61, 61. The V member 18 has fixed in position in its upper most end'by a set screw 62, a clevis 63 having pivotally mounted therein a hook 64' normally adapted to engage a pin 65 carried by the clevis 66 fixed to the rod 18*? by means of a set screw 67. The rod 18 is normally supported in the raised position shown 'inFig.

8 by means of a spring 68 encircling such rod and held under compression between the boss 58 and the sliding block 69 secured to 'such rodby means of the set screw 70. The

hook 64, which as will be seen on inspection of Fig. 8,,is pivoted in. the clevis 63 as indicated at 71, is normally held in the position shown by means of a tension spring 72, one

' end of which is-fastened to the block 59 as indicated at 73 and the other engages a lever arm 74 formedon said hook and disposed just above the tripping rest 75 provided with an adjusting'screw '76, the function of which .will be pointedout hereinafter in connection with the description of the operation of the .present machine. In the operationof a punch press of the character above described containing the safety latch for the clutch .operating rod thereof embodying my present invention, it

will be observed that the operator mustdepress the push rod 30 by his lefthand, there'- by moving the lever 31 ,and rocking the.

dependingarm 42 carried 'by the counter shaft 33 from the position shown in Fig. I

1 to the position shown in Fig. 6. This rocking'movement by virtue of the engagement of the roller 43 carried'by the pm 43 and engaging the hook 44 will move the-lever 45 to the right or rearwardly of the machine,

and by virtue of the pivotal connection indicated at 46- this will move the upright arm' 47 in the same direction, releasing the bifurcated catch 48 from the cone 50, which will permit the push rod 27 to be depressed by the right hand of theoperator, thereby lowering the clutch operating rod 18 (see Fig. 1) and allowing the crank. shaft 16 to revolve. When interrupting mechanism, such as is shownin the devlcefof Figs. 6 to 10 is employed, the lowering of the rod 18 causes the arm 74 to strike the .trip 'rest (or the set. screw 76, which-is provided. forthe purpose of varying thecritical movement of the operation of the trip,.) thereby causing the hook 64 to disengage itself from the pin 65, releasing the rod 18" which is" immedi-'-, ately lifted by means of the spring-68 and the clutch thereby thrown out, and the movement ofthe crank shaft 16 stopped.

The complete cycle of operation of the machine is now completed, and the levers 23 z and 31 must both'be returned to their normal positions shown in Fig. 1 before the opera-' tion can berepeated for the reason that raising of the lever 31 alone will not cause or permit repetition of the cycle of operation since such-lever has no actuating engagement with the rod 18, or either part 18 or 18 thereof, and raising of the rod 23 alone followed byredepression thereof will not cause 'of 'permit it since such lifting is accomplished by a pushing away of the'catch 48 by the cone 50 and immediate engagementywi'th the lower surface of such cone 50 by the catch 48, due to the action of the spring 55, which prevents any substantial movement of the lever 23 until the connection is reestablished between the 'arm 42 and hook 44 and rearwardmovement of said arm 42 again withdraws the catch 48 from the cone 50. Immediately upon the'depression of the rod'51 subsequent upon depression of the rod 23, the latch 48 rides onto the cone 50 by virtue of the action of the spring 55 drawing the upright member 47 to the left or toward-the front of the machine and simultaneously carrying the lever 45 in the same direction and causing the hook 44to abut underthe roller 43, thus restoring the Obviously as soon as. the lever 23 is lifted, the spring 72 tends to retract the hook 64 from the position shown in Fig. 6' to that .parts 44 and 48 in position to bereengaged by the parts 43 and 50 uponthe lifting of the levers31 and 23 respectively.

' shown in Fig. 8, which causes; the hook 64 to I reengage the pin 65 and accomplish the f hook and link connection between the parts 18" and 18 Wl1ich will remain restored until the rod 18" is again depressed by depression of the lever 23, as above described.

Having thus described my invention and illustrated its use, what I claim'as new and desire to secure by Letters Patent 152 1. an apparatus of the-character described, in combination with means for controlling. a power supply, a primary menu ally operated lever for actuating the, com

trolling means, and a secondary manually operated lever for controlling the operation of said firstmentioned lever, both of said levers being arranged to require movement -.--operated'le ver for actuating the controlling ;means -and a secondary'manually opera-ted 1. lever S for controlling-the operation of said first mentionedglev er, -said 'lever i being inoperatively connected to said power scribed, in combination with means for con controlling means, and a locking device for preventing said primary lever be ng d epressed whensaid-secondary lever is in its -ino erativevosition said] rimar lever be ing inoperative except when said secondary lever is in operative position.

- 3. In'an' apparatus of the character described, in combination with means for controlling a power supply, a primary manually operated'lever for 'actuatingthe con- I trolling means, a secondary manually oper. ated lever for controlling the operation of y said first mentioned lever, and an interruptin device for discontinuingthe actuating re ation between said primary lever and said power controlling means upen complction of the initial movement of sald primary lever. I j ,4. In an apparatus of the character detrolling a power. supply, a. rimary manually operated lever'for actuating the controlling means, a secondary manually operated lever for controlling the operation of said first mentioned lever, and an, interrupting device-for discontinuing the actuating relation-between said primary lever and said power controlling means upon completion of the initial .movement of said primary lever, said] levers being arranged for consecutive movement into operative position controlling means may be actubefore said ated scribed, incombination with means for controlling a power supply, a primary manually operated lever for actuating the con-' trolling means, a secondary manually operatedlever for controlling 'theoperation of saidfirst mentioned lever, and an interrupt device for discontinuing-the "actuating relation-between said primary lever and said power controlling means upon completion of the, initial movement of said primary lever, said levers being arranged for consecutive movement into and out of operative position iii-beginning and repeating the actuation of said power'controlling means.

6-. Inan apparatus of the character de- "scribed, in combination with means for controllinga power supply, a primary manually operated leverfor actuating'the controlling means, a secondary. manually operated lever for controlling the operation of said first mentionedlever, and an interruptmg device for discontinuing the actuating relation between said primary lever upon completion of the initial movement of said .primary lever and said power controlling means, said secondary leverbeing arranged to require restoration to normal position before the operation of said primary'lev'er may be repeated.

an apparatus of the character de-' 7. In an -apparatusof the character de scribed, in combinationwith means for controlling a power supply, aprimary manually operated lever for actuating the controlling means, a secondary manually operated lever for controlling the operation of said first mentioned lever, and an interrupting device for discontinuing the actuating relation between said, primary lever and said power controlling means, upon completion of the'initial movement of said primary lever, said primary lever being inoperative except when 'saidsecondary'lever'is in operative position and said secondary lever being arranged to-require alternative restorationto inoperative position andmovement therefrom before said first mentioned lever may be again operated.

' 8. In an apparatus ofthe character described, in combination with means for controllinga power supply, a primary manually opieratedlever for actuating the controlling means; a secondary manually operated lever for controlling the operation of said first mentioned "lever, and an interrupting device for discontinuing the actuating relation between said primary lever upon completion of the initial movement of said primary lever,-said secondary lever being inoperatively connected to said power controlling means, and said primary lever being inoperative except when said secondary lever isin operative position.

9. In an apparatus of the character described, in combinationwith a main frame and ,ineans for controlling a power vsupply supported thereby, a primary manually operated lever for actuating the controlling means engaging said means and pivotally mounted on the frame, a resiliently supportedlock engaging said lever and means, an upright arm pivoted about said pivot point and provided with a catch resiliently engaging said look, a rock'sha'ft carried by the frame, a resiliently supported secondary lever and a rocker arm mountedon said shaft, and a resiliently held lever provided with a hook'engaging said rocker arm and pivotedto said upright arm. 1 10. In an apparatus of the character described, in combination with means for controlling a power supply, a primary manually operated lever for actuating the controlling means permanently connected thereto, and a secondary manually operated lever -for controllingtheoperation of said firstmentioned lever, both said levers being ar ranged to require consecutive movement into operative position before said operating means may be actuated. 7 r 11. In an apparatus of'the character described, in combination with means for controlling 'a power supply, a primary manually operated lever for actuating the controllingmeans, and a secondary manually I operated lever for controlling the operation of said first-mentioned lever, said primary lever requiring the movement of said secondary lever before it can be moved.

12. In an'apparatus of the character described, in combination with means for controlling a power supply, a primary manually operated lever for actuating the controlling means, A controlling means permanently connected thereto, and a secondary manually operated lever for controlling the operation of said first-mentioned lever, said primary lever requiring the movement of said secondary lever before it can be moved.

13. In an apparatus of the character described, in combination with meansfor controlling a power supply, a primary manually operated lever for actuating the controlling means, a secondary manually operated lever arranged to require alternate movement relatively to the primary lever .for controlling the operation of said firstmentioned lever, and a member adapted to prevent the operation of said lever except when moved out of engagement therewith by' said secondary lever.

15L. In an apparatus of the character described, in combinationwith means for controlling a power supply, a primary manually operated lever for actuating the controlling means, and a secondary manually operated lever arranged to require alternate movement relatively to the primary lever for controlling the operation of said firstmentioned lever, a member adapted to prevent the operation of said lever except when moved out of engagement therewith by said secondary lever, and means operated by said primary lever for restoring said member to engaging position after the operation of said primary lever. r

15. In an apparatus of the character described, in combination with means for controlling a power supply, a primary manually-operated lever for actuating the con-.

into operative position before said operating means may be actuated.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

OSCAR L. SOALBOM.

Witnesses MARTHA WESTMAN, PAUL CARPENTER. 

